they have historical and law enforcement grounds for claims of sovereignty. it says bringing up an unsigned document demonstrates a lack of confidence over the issue among japanese. the statement says what it calls tricks won't change the fact that the islands are chinese territory. >>> geothermal power is attracting global attention. in southeast asia, the philippines is taking advantage of the sustainable energy source and its usage rate is the second highest in the world. now it's strengthening its industry by teaming up with counterparts from around the globe. >> reporter: steam rises and the air smells faintless of rotten eggs. it is the second largest geothermal power plant in the philippines. the philippines scrapped their nuclear power program in the 1980s in order to pursue renewable energy. gee yoe thermal accounts for 22% of the country's energy. that is the second highest rate in the world. the national economy is on the rise as is the demand for power. to meet that growth, the government has the ambitious goal of increasing total geothermal power